From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2 Date: Wed, 09 Jun 2010 18:17:50 +0300 Message-ID: <4C0FB09E.1080604@redhat.com> References: <4C0E3C46.30901@dlh.net> <4C0E3CD5.4070202@redhat.com> <4C0E4576.8030609@dlh.net> <4C0E46ED.5030305@redhat.com> <4C0E47C3.1050409@dlh.net> <4C0E484D.4060609@redhat.com> <4C0E492F.6060203@dlh.net> <4C0E495C.8020008@redhat.com> <4C0F50ED.7060109@dlh.net> <4C0FAE67.3010002@redhat.com> <20100609151214.GC14316@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Peter Lieven , kvm@vger.kernel.org, qemu-devel@nongnu.org To: Gleb Natapov Return-path: Received: from mx1.redhat.com ([209.132.183.28]:45024 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753967Ab0FIPRz (ORCPT ); Wed, 9 Jun 2010 11:17:55 -0400 In-Reply-To: <20100609151214.GC14316@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 06/09/2010 06:12 PM, Gleb Natapov wrote: > >>> a) i remember that there (have been) are instructions that have a >>> high virtualization penalty. >>> are there flags that should better not be offered to a VM? >>> >> Not that I know of. >> >> > rdtscp? I think it's always emulated. > No, it executes natively. It does increase the msr switching cost since we need to switch MSR_TSC_AUX in addition. -- error compiling committee.c: too many arguments to function